/Engine/Plugins/Protocols/MQTT/Source/MQTTCore/Public/IMQTTCoreModule.h
Get or creates an MQTT client that uses the project default URL. An existing client is returned for a matching URL.
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IMQTTClient](API\Plugins\MQTTCore\IMQTTClient), ESPMode::ThreadSafe > GetOrCreateClient ( bool bForceNew )